Which of these combinations will produce a buffer? (check all that apply) 1 mole of a weak acid and 0.2 mole of its conjugate base 1 mole of a weak acid and 0.5 moles of NaOH 1 mole of NaOH and 1 mole of HCl 1 mole of a weak acid and 1 mole of NaOH 1 mole of a weak acid and 0.01 mole of its conjugate base 1 mole of a weak base and 1 mole of HCl 1 mole of a weak base and 0.5 moles of NaOH 1 mole of a weak base and 0.5 mole of HCl 1 mole of a weak acid and 1 mole of its conjugate base